Apparatus for sharpening cutting implements



Dec. 19, 1922. I

APPARATUS FOR SHARPENING CUTTING IMPLEMENTS.

FILED AUG-25. 132l- Y Y ATTORNEY 1,439,230. J. c. CONN.

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Application filed August 25, 1921. Serial racemes.

550.5471 whom it may concern:

Be it known that l, Josnrrr- C. Conn, a citizen of the United States, and a resident oi Boonton, Morris County, State oi" New Jersey, have invented an Improvement in Apparatus for Sharpening Cu ting implements, of which the following is a specification.

The present invention relatesto an improvement in apparatus for sharpening cutting implements. One object. of the improved method is to make or renew the cutting edges of cutting implements without loss of metal and an object of the improved apparatus isto provide a device wherebythe cuttlng edge of a cutting implement may conveniently be made or renewed bypressure p and re-iiormation of the metal rather than by abrasion. Among the advantages flowing from the practiceo'f my improved method or the use of my improved device is the production of a cutting. edgel formed' by compacted metal. Where the comprising my invention are applied tothe renewing of cutting edges'or. in sharpening knives or blades dulled by use, the lite of the implement is prolonged since no metal is removed from the blade and the edge will last longer because the compacting of the metal renders it more resistant to deformation and attrition in normal use. @ther advantages varying in degree and character will be apparent after a full description or. my invention and an explanation of itsmode of application and operation.

One embodiment of my. invention so far as it relates to apparatus for sharpenino' cutting implements is illustrated in the ings accompanying the present application and in which,

Figure 1 is a top view;

Figure 2, a side elevation;

Figure 3, an end view; and

Figure 4, a view in section showing a blade. having a portion of the metal compacted to form a cutting edge.

The novelty and utility o'lflmy improved method of sharpening cuttingimplements such as table knives, for example. will be readily understood from a comparison with methods in common use. Among these is the method of sharpening by abrasion in which a grindstone, a whet stone, or other equivalent implement is brought into abrading contact with the metal of the knife in such a Way as to form a new edge by removing improvements metal from each side thereof, or in some cases from only one side. In the practice of my methochhowever, i remove no inetal but prefer to secure an edge forming attend ation by drawing down and compacting the metal locally. a

While do not intend to prescribe any single term ot apparatus to carry out this 'method or to limitthe practice thereof to such singlc itorm, have. found that apparatus embodying the elements disclosed in the above-mentioneddrawings may be effectively employed. Referring to said drawings, it will appear t Lat sharpening apparatus embodying. my invention includes co-opcrating metal compacting elements termed and/mounted to engage a longitudinally disposed portion such as theedge of a knife to impart thereto an attenuating and compacting pressure. For examp'lefthe illustrated embodiment of my iinproved sharpener in-.

cludes a pair of similar co-operating rolls each havinga cylindrical portion 1 and a substantially frustoconical portion 2, said rolls being mounted at oneend in bearings forming part of spaced roll supports 3 a. A flat plate or base 5 is provided with holes 6 and 7 through which suitable bolts may be passed to'fasten the apparatus to a table, bench, or the like where it will bereadily available for use, as in a hotel or household. 'One of the roll supports 3 and is adjustable with respect to the other, in the present case, the support l being movable relatively to support 3 to permit adjustment. In order that this may conveniently be accomplished, it have provided the support 3 with a threaded recess 8 which receivesthe threaded bolt 9 passing through the movable support l. illnotherthreaded bolt passes through the fixed support 3 and its inner end forms an adjustable stop 10. By the means just described, the rolls can be rigidly positioned with their cylindrical surfaces in rolling contact and with their opposed trustoconical surfaces forming oppositely in clined sides of a V-SllLP6l space between them. Where, the rolls are mounted as shown, with their longitudinal axes vertically disposed, the base plate will have aportion of one edge cut away to form a recess or notch 11 and the base willbe secured to the table or other support in such a' manner that the rolls and the roll supporting portion of the base will overhang the edge of the table, said arrangement and the notch and 11 being provided for a purpose to be hereinafter mentioned i in the operationof the illustrated embodiment of my improved.v apparatus an edge of the knife to be sharpened will be inserted between the; portions 2 Of-tll rolls and will be drawn forwardwhile exerting firm downward pressure;-l The rolls will rotate by reason ottheir frictional engage-c ment with the knife and-in so doing will compact the metal adjacent to :the edge while it is beingdrawn or attenuated by such compacting actionythe operation being repeated often enough to bring about the desired forming or reformingof the cutting edge. )bviously it isv immaterial whether theknife is moved relatively to the rolls or vice versa, noriis iti essential that the Operating P b supplied manually k $11168 it 1S contemplated that 7 any su t bl meansftor effecting rollingco'ntact between the knife and the cc-operating rollers to produce a local edge formingicompacting of the metal of theknife will fall within the new to cold roll a portion of a cutting im plement to provide it With a cold rolled cutting edge which possesses the advantages in use hereinabove referred to, as Well as others.

i fhat I claim is: p I

,1. A knife sha pening device comprising va pair offreely rotatable rolls arranged in unyielding peripheral rolling contact with each other as to corresponding cylindrical portions oitheir peripheral surfaces and in spaced relation as to corresponding frustoconical surfaces, rolls being journaled to rotate freely by frictional engagement With a manually reciprocated knife blade.

2 A kniie sharpening device comprising cooperatino knife edge compacting rolls having; c dindrical surfaces in rolling contact and trustocenical surfaces in spaced relation to admit a knife blade edge between them, a supporting base for said rolls provided with a notch in advance of the space between the frustoconical surfaces of the rolls to permit normal, longitudinal edge compacting movement of a knife between the rolls and a notch underlying contiguous portions oltherolls to permit free passage of the blade when deflected downwardlv upon its withdrawal from engagement with the rolls a In testimony whereofil have signed my name to this specification this 18th day of August, 1921.

JOSEPH C. CONN. 

